Product Description
Solvent Blue 104 (CAS 116-75-6), chemically 1,4-bis(mesitylamino)-9,10-anthraquinone, is a reddish-blue anthraquinone solvent dye supplied as a fine dark-blue powder. It is valued in transparent plastic and fiber coloring for its clean blue shade, high tinting strength, good heat stability and low migration, and is one of the standard blue dyes used by masterbatch and engineering-plastic compounders.
Its performance rests on the anthraquinone chromophore. First, the planar 9,10-anthraquinone core flanked by two mesitylamino substituents gives a deep, transparent reddish-blue with high molar absorptivity, so very low loadings are enough to reach target shades. Second, the bulky 2,4,6-trimethylphenyl (mesityl) groups shield the polar amino groups, which raises solubility in non-polar plastics and mineral oils, reduces bloom and migration, and improves compatibility with polyolefins, polystyrene and polyesters.
Commercially, Solvent Blue 104 is known as Transparent Blue 2B or Solvent Blue RBL. It is soluble in most organic solvents and polymer melts, gives transparent, lightfast and heat-stable coloration, and is typically used at 0.01–0.5% on weight of polymer. It is also used as a shading component in blends with red, yellow and green solvent dyes to produce neutral blues, purples and grays.
Product Parameters
| Item | Specification |
|---|---|
| Product Name | Solvent Blue 104 |
| CAS No. | 116-75-6 |
| Color Index No. | 61568 |
| Chemical Name | 1,4-bis(mesitylamino)-9,10-anthraquinone |
| Molecular Formula | C₃₂H₃₀N₂O₂ |
| Molecular Weight | 474.60 |
| Appearance | Dark blue / reddish-blue powder |
| Shade | Reddish transparent blue |
| Dye Type | Anthraquinone solvent dye |
| Melting Point | ~ 210 – 220 °C |
| Heat Resistance (plastics) | ~ 280 – 300 °C |
| Light Fastness | Good (≈ 6–7 on gray scale) |
| Solubility | Soluble in organic solvents and polymer melts |
| Typical Dosage | 0.01 – 0.5% on polymer weight |
| Packaging | 25 kg fiber drum / carton |
Product Application
Solvent Blue 104 is a high-performance blue solvent dye mainly used in polymer coloring, spin-dyeing of polyester, and industrial inks and coatings, chosen for transparency, heat fastness and low migration.
In plastics coloring, it is widely used for transparent and translucent parts made of PS, HIPS, ABS, PC, PMMA, SAN, AS, rigid and flexible PVC, PET, PA and polyolefins. It is the standard blue for optical accessories, transparent ornaments, cosmetic packaging, home appliances, toys, automotive interior parts and daily plastic goods, where a clean, transparent blue with good light and heat fastness is required.
In synthetic fiber spin-dyeing, Solvent Blue 104 is highly recommended for polyester (PET) fiber and polyester filament, where it is incorporated before or during spinning to give deeply colored, wash-fast and light-fast yarns that do not bleed during textile finishing.
In inks, coatings and industrial finishes, it is used in solvent-based inks, wood stains, lacquers, transparent coatings, oil-based colorants and candle/wax colorants, where its solubility in organic solvents and compatibility with resins give uniform, transparent films.
